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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d7e71f30bb4c5e6b82718ec14801de5abf42a06b631cc7a27651789be4459f' 
  AND token = 'aNxELyrO60jXVlFHmuOQJfEMUunxjXP0Vwhm/9VELGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}